proto
flue air co2 concentration sp point
implements
| air | 
 The mixture of gases which surrounds the earth  | 
|---|---|
| co2 | 
 Carbon dioxide (CO₂)  | 
| co2-concentration | 
 Concentration of carbon dioxide (CO₂) in the air  | 
| concentration | 
 Abundance of substance in the total volume of a mixture  | 
| flue | 
 Duct for exhausting combustion  | 
| point | 
 Data point such as a sensor or actuator  | 
| sp | 
 Point is a setpoint, soft point, internal control variable, schedule  |